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Which of the following will give 3-pentanone.
\( \mathrm{P} \)
(A) \( \left(\mathrm{CH}_{3}-\mathrm{CH}_{2} \mathrm{COO}\right)_{2} \mathrm{Ca} \stackrel{\Delta}{\longrightarrow} \)
W
(B) \( \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{C} \equiv \mathrm{N} \)
(1) \( \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{MgBr} \)
(2) \( \mathrm{H}_{3} \mathrm{O}^{\oplus} \)
(C)
(1) \( \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{MgBr} \)
(2) \( \mathrm{H}_{3} \mathrm{O}^{\oplus} \)
(D)
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